Speech Therapist Mom is a Youtube channel full of videos for children to target language skills.
Story Online is a website where celebrities read stories to children. Often, there is a "teachers guide" which is a great way to practice answering who,what, where, when, and why questions
Quia is a website full of speech therapy games. Make sure to select "language development" or communication disorders" under subcategory. This is a great independent practice for 4th-8th graders.